JP2008006567A - Insert for spherical surface cutter, and insert attaching/detaching type spherical surface cutter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide inserts for a spherical surface cutter allowing mounting on mounting seats formed at both end parts of an axis direction and remarkable reduction of using cost to lengthen their using service lives, and an insert attaching/detaching type spherical surface cutter capable of mounting the inserts. <P>SOLUTION: Each of the inserts 10 for the spherical surface cutter is mounted on the spherical surface cutter forming a spherical surface shaped spot face part in a cavity part provided in a workpiece. The insert 10 is formed into a polygonal flat plate shape in its external shape, and has two polygonal faces 11 and side faces 12 intersecting the polygonal faces 11. The one polygonal face 11a is made a rake face. In the one polygonal face 11a, a pair of circular-arc ridge line parts projected and curved toward an outer peripheral side of the polygonal face 11 and line-symmetrically arranged are formed. In the circular-arc ridge line parts, circular-arc shaped cutting blades 13 are provided. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a spherical cutter insert and an insert detachable spherical cutter to be mounted on a spherical cutter that forms a spherical counterbore in a cavity provided in a workpiece.

  Conventionally, as a spherical cutter that forms a spherical counterbore on the inner surface of a cavity formed in a workpiece, both end surfaces in the axial direction of a substantially cylindrical tool body extending along the axis are formed into convex curved surfaces. A plurality of recesses are arranged on both end surfaces at intervals in the circumferential direction, and a cutting edge tip having an arcuate cutting edge on a wall surface facing the front side in the tool rotation direction T of the recesses is What is brazed in the state which protruded from the end surface is widely provided.

Here, these cutting blades are polished for each end face in a state where the cutting edge chips are brazed, so that each end face has a center on the axis of the tool body and is slightly radiused than the end face. It is formed so as to be located on a large spherical surface.
Further, the tool body is formed with mounting holes extending along the axis so as to open on both end faces, and the axially inner portion of the mounting hole has a square cross section centered on the axis. Is formed.

  Such a spherical cutter is accommodated in a cavity formed in the workpiece, and a pair of machine tools from the outside through a pair of insertion holes formed coaxially in the workpiece so as to communicate with the cavity. Each arbor is inserted, and the tips of these arbors are rotated around the axis through the arbor by attaching them to the mounting holes from both sides in the axial direction. Then, by rotating the tool main body and feeding the arbor so as to reciprocate integrally with the tool main body on both sides in the axial direction, the insertion holes are formed around the insertion holes on the inner surface of the cavity portion. A concave spherical counterbore centered on the axis is formed by the cutting edge of the cutting edge tip brazed to the end face of the tool body facing sideways. Here, by adjusting the feed amount by the arbor, the centers of the concave spheres formed by the counterbore portions are made to coincide with each other, thereby forming counterbore portions that are bent along one spherical surface at both ends of the inner surface of the cavity portion. Is.

  However, in the spherical cutter of this configuration, the cutting edge tip is brazed to the tool body, so that when the cutting edge is worn, the cutting edge is re-polished like a normal brazing tool. . If the cutting edge is repolished while keeping the diameter of the arc formed by the cutting edge constant, the center of the arc will be displaced in the axial direction. The feed amount needs to be changed. Therefore, there is a possibility that the spherical counterbore cannot be formed with high accuracy due to a feed amount setting error, a measurement error of the cutting edge position, or the like. In addition, since the tool body and the cutting blade are integrally formed by brazing, when the material of the cutting blade is to be changed depending on the material to be cut, the spherical cutter itself must be replaced. Therefore, it is necessary to prepare many spherical cutters according to the above, and there is a problem that the use cost of the spherical cutter increases.

Therefore, as shown in Patent Document 1, for example, there is provided an insert detachable spherical cutter in which a mounting seat is formed on an end surface of a tool body, and an insert having a cutting blade is detachably mounted on the mounting seat.
This insert detachable spherical cutter has a tool body that rotates about its axis, and a plurality of recesses are formed on both end surfaces in the axial direction of the tool body, and a mounting seat is provided on the rear side of these recesses in the tool rotation direction. It has been.

The conventional insert mounted on this mounting seat is made of a hard material such as cemented carbide, for example, and has an outer shape of a substantially rectangular flat plate, two rectangular surfaces and four side surfaces intersecting these rectangular surfaces. Have One square surface is a rake face that faces the front side of the tool rotation direction, and one side of the rake face is projected in an arc shape toward the outside, and an arc-shaped cutting blade is provided. Yes. That is, one arcuate cutting edge is formed in one insert.
This insert is arranged so that one rectangular surface, which is a rake face, faces the front side in the tool rotation direction, and the arcuate cutting edge faces the axial direction outward from the end face of the tool body, and is attached by a clamp screw. Fixed to the seat.

With this spherical cutter, even if the cutting blade is worn, the insert can be replaced and used, so that the center of the arc formed by the cutting blade can be made constant, and there is no need to adjust the feed amount for each spherical cutter. Furthermore, when it is desired to change the material of the cutting blade depending on the material to be cut, it can be dealt with by simply replacing the insert, and it is not necessary to prepare many tool bodies, and the cost of using the spherical cutter can be greatly reduced. Moreover, since the position of the cutting blade can be adjusted by pressing the insert, the cutting blade is positioned on a spherical surface having a center on the axis of the tool body even when the cutting blade is worn and the insert is replaced. Can be arranged as follows.
JP 2000-343316 A

By the way, in the insert detachable spherical cutter described in Patent Document 1, since mounting seats are formed at both ends in the axial direction, the mounting seat formed at one end rotates clockwise about the axis. The so-called right-handed insert is mounted, and the mounting seat formed at the other end is mounted with a so-called left-handed insert that is rotated counterclockwise about the axis. Therefore, it is necessary to manufacture and manage two types of inserts, which increases the cost of using the inserts.
In addition, since only one arcuate cutting edge is provided in one insert, the insert is discarded when the arcuate cutting edge is worn, and there is a problem that the service life of the insert is shortened. It was.

  The present invention has been made in view of the above-described circumstances, and can be mounted on mounting seats formed at both ends in the axial direction, can extend the service life, and can greatly reduce the use cost. An object of the present invention is to provide a spherical cutter insert and an insert detachable spherical cutter to which the spherical cutter insert can be attached.

  In order to solve this problem, a spherical cutter insert according to the present invention is a spherical cutter insert that is attached to a spherical cutter that forms a spherical counterbore in a cavity provided in a workpiece. Has a polygonal flat plate shape, has two polygonal surfaces and side surfaces intersecting these polygonal surfaces, one polygonal surface is a rake surface, and the one polygonal surface includes: A pair of arc ridges that are curved toward the outer peripheral side of the polygonal surface and are symmetrical to each other when viewed from the side facing the rake face are formed, and an arcuate cutting edge is formed on the arc ridge. It is characterized by being provided.

  Further, the insert detachable spherical cutter according to the present invention is provided with the above-mentioned insert for a spherical cutter, and the insert detachable which forms a spherical counterbore in a cavity provided in the workpiece by the arc-shaped cutting blade. A spherical cutter having a tool body that rotates about an axis, the tool body having mounting seats on both end faces facing the axial direction, the mounting seat having the arcuate shape. A contact surface for positioning the cutting blade is formed.

  According to the spherical cutter insert and the insert detachable spherical cutter having this configuration, a pair of arcuate cutting edges are formed on one polygonal surface which is a rake face, so two arcuate cutting edges are formed on one insert. After the blade is formed and worn using one arcuate cutting blade, the position of this spherical cutter insert can be changed and mounted, and another arcuate cutting blade can be used, The service life of this spherical cutter insert can be extended.

  Also, the pair of arc ridges are arranged symmetrically with each other when viewed from the side facing the rake face, and the arc ridges are provided with arcuate cutting edges. One arc-shaped cutting blade can be used when mounted on the mounting seat formed on the end face of the other, and another arc-shaped cutting blade can be used when mounted on the mounting seat formed on the other end face. . Therefore, this spherical cutter insert can be used as a right-handed and left-handed insert, and there is no need to manufacture and manage two types of inserts, and the cost of using the spherical cutter insert can be reduced.

  Further, in the insert detachable spherical cutter having this configuration, since the contact surface for positioning the arcuate cutting blade is formed on the mounting seat, the arcuate cutting is performed with the spherical cutter insert mounted on the mounting seat. The position of the blade is fixed, and cutting can be performed satisfactorily.

  Here, the outer shape is an isosceles trapezoidal flat plate shape, has two isosceles trapezoidal surfaces and the side surfaces intersecting these isosceles trapezoidal surfaces, and one isosceles trapezoidal surface is a rake surface, A pair of hypotenuses provided on the isosceles trapezoidal surface is a pair of the arc ridge lines, and the pair of arc ridge lines is the same as viewed from the side facing the one isosceles trapezoid surface. It may be an insert for a spherical cutter formed symmetrically with respect to a reference line that bisects the long side and the short side of the leg trapezoidal surface.

  Further, the side surface connected to the arcuate cutting edge may be inclined so as to gradually recede toward the inner peripheral side of the polygonal surface as it is away from the one polygonal surface. In this case, a positive clearance angle is given to the side surface connected to the arcuate cutting edge, that is, the flank, and the cutting of the arcuate cutting edge can be improved and cutting can be performed well.

  According to the present invention, there is provided a spherical cutter insert and a spherical cutter insert that can be mounted on mounting seats formed at both ends in the axial direction, can extend the service life, and can greatly reduce the cost of use. An attachable / detachable spherical cutter can be provided.

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 to 4 show a spherical cutter insert according to an embodiment of the present invention, and FIGS. 5 and 6 show an insert detachable spherical cutter to which the spherical cutter insert is attached.
The insert 10 for a spherical cutter according to the present embodiment is made of a hard material such as a cemented carbide, has an outer shape that is substantially an isosceles trapezoidal flat plate, and isosceles trapezoids arranged in parallel to each other. It has a surface 11 and four side surfaces 12 intersecting these two isosceles trapezoidal surfaces 11.

One isosceles trapezoidal surface 11a is a rake surface directed toward the front side in the tool rotation direction T, and the other isosceles trapezoidal surface 11b is a mounting surface disposed to face a mounting seat 32 described later.
A pair of hypotenuses provided on one isosceles trapezoidal surface 11a, which is a rake face, is formed in an arc shape that is curved toward the outer peripheral side of the isosceles trapezoidal surface 11a. Arc-shaped cutting blades 13 and 13 are respectively provided at the ridges of the oblique sides.
Here, the pair of arcuate cutting blades 13 and 13 is a reference line that bisects the long side and the short side of the one isosceles trapezoidal surface 11a when viewed from the side facing the one isosceles trapezoidal surface 11a. It arrange | positions so that it may become symmetrical with respect to S.

  A side surface 12a continuous with the arcuate cutting edge 13, that is, a side surface 12a intersecting with a hypotenuse of the isosceles trapezoidal surface 11 serves as a flank and protrudes toward the outer peripheral side of the isosceles trapezoidal surface 11 as shown in FIG. As shown in FIGS. 3 and 4, it is inclined so as to gradually recede toward the inner peripheral side of the isosceles trapezoidal surface 11 as it is away from the isosceles trapezoidal surface 11a. Yes. Accordingly, when viewed from the side facing the side surface 12b continuous to the long side and the side surface 12c continuous to the short side, the spherical cutter insert 10 is formed on the side of the other isosceles trapezoidal surface 11b as shown in FIGS. It has an isosceles trapezoidal shape in which the ridge portion is a short side and the ridge portion on the side of one isosceles trapezoidal surface 11a is a long side.

  As shown in FIG. 2, the side surface 12b intersecting the long side of the isosceles trapezoidal surface 11 and the side surface 12c intersecting the short side are one isosceles trapezoidal surface 11a (rake face) and another isosceles trapezoidal surface 11b ( It is formed in a planar shape extending perpendicular to the (mounting surface) and is arranged in parallel to each other. Therefore, as shown in FIG. 2, the spherical cutter insert 10 has a rectangular shape when viewed from the side surface 12a connected to the oblique side.

  Further, the center portion of the isosceles trapezoidal surface 11 extends in a direction orthogonal to one isosceles trapezoidal surface 11a and the other isosceles trapezoidal surface 11b and penetrates in the thickness direction of the insert 10 for this spherical cutter. An insertion hole 14 is formed. A tapered hole portion 14a is formed in the opening portion of the one isosceles trapezoidal surface 11a side of the insertion hole 14 such that the inner diameter gradually decreases toward the other isosceles trapezoidal surface 11b side.

  Next, the insert detachable spherical cutter 20 configured by mounting the above-described spherical cutter insert 10 will be described. The insert detachable spherical cutter 20 has a tool body 21 having a substantially cylindrical shape extending along the axis O. In the central part of the tool body 21 in the direction of the axis O, a concave groove 22 is formed over the entire circumference of the tool main body 21 in the radial inner side, and a pair of grooves extending in parallel with the axis O is formed in the concave groove 22. The flat surfaces 23 are arranged in parallel to each other. Here, in the present embodiment, the tool body 21 is formed so as to be symmetric with respect to the virtual plane Q that is orthogonal to the axis O and is located in the center of the axis O direction.

Both end portions 24 and 24 of the tool main body 21 sandwiching the concave groove 22 are formed into convex curved surfaces having end surfaces 25 each having a center P (P ′) on the axis O, and both end portions 24 and 24 A pair of flat portions 26 and 26 parallel to the flat surface 23 are also formed on the outer peripheral surface 24.
The center P of the spherical surface formed by the end surface 25 facing one side (right side in FIG. 5) is located on the other side of the virtual plane Q, and the spherical surface formed by the end surface 25 facing the other side (left side in FIG. 5). The center P ′ is located on one side of the virtual plane Q, and the length of the tool body 21 in the axis O direction is set smaller than the diameter of the spherical surface formed by the end face 25.

  Mounting holes 27 extending along the axis O are formed in the tool body 21 so as to open toward the respective end surfaces 25. As shown in FIGS. 5 and 6, the mounting hole 27 is formed with a pair of key groove portions 28 that protrude to the outer peripheral side of the mounting hole 27 and extend parallel to the axis O. A large-diameter hole 29 having a one-step large diameter is formed in the opening portion on the end surface 25 side of the mounting hole 27. Further, an annular flat surface portion 30 is formed at the opening edge of the mounting hole 27 in the end surface 25 by chamfering perpendicularly to the axis O.

  A pair of recesses 31 and 31 that open toward the end face 25 are formed at both end portions 24 and 24 so as to be 180 ° rotationally symmetric about the axis O. As shown in FIG. 5 when viewed from the front side of the tool rotation direction T, the recess 31 is substantially L-shaped by a wall surface 31 a facing outward in the axis O direction and a wall surface 31 b facing outward in the radial direction of the tool body 21. As shown in FIG. 6 when viewed from the O direction, a wall surface 31b facing the tool body 21 radially outward and a wall surface 31c facing the front side in the tool rotation direction T form a substantially L shape.

  A mounting seat 32 for mounting the spherical cutter insert 10 is formed on the wall surface 31c of the recess 31 facing the front side in the tool rotation direction T. The mounting seat 32 is recessed one step from the wall surface 31c facing the front side in the tool rotation direction T of the recess 31 toward the rear side in the tool rotation direction T, and is opened outward in the axis O direction. In the present embodiment, as shown in FIG. 6, the wall surface 32 b facing the tool body 21 radially outward of the mounting seat 32 and the wall surface of the recess 31 facing the tool body 21 radially outward are 31 b and the opening edge of the mounting hole 27. It is formed so as to intersect the annular flat surface portion 30 formed in the above.

Here, a clamp screw hole (not shown) extending so as to be orthogonal to the wall surface 32c is formed in the wall surface 32c facing the front side in the tool rotation direction T of the mounting seat 32.
Further, a first abutting surface 33 with which a side surface 12b continuous with the long side of the isosceles trapezoidal surface 11 of the spherical cutter insert 10 is abutted on a wall surface 32b facing the tool body 21 radially outward of the mounting seat 32. Is formed.
Further, the mounting seat 32 is provided with a facing surface 34 on which a side surface 12c connected to the short side of the isosceles trapezoidal surface 11 of the spherical cutter insert 10 is opposed. The first contact surface 33 and the facing surface 34 are arranged so as to extend in parallel to each other and in parallel to the axis O.

  Further, as shown in FIG. 5, the wall surface 32 a facing the outside in the axis O direction of the mounting seat 32 is positioned on the outer side in the axis O direction than the wall surface 31 a facing the outside in the axis O direction as shown in FIG. Inclined so as to gradually recede toward the inner side in the direction of the axis O as it goes inward. A second contact surface 35 is formed on the wall surface 32a so that the side surface 12a connected to the arcuate cutting edge 13 of the spherical cutter insert 10 is contacted.

  The spherical cutter insert 10 is mounted on the mounting seat 32 of the tool body 21 as follows. The insert 10 for the spherical cutter has a long side of the isosceles trapezoidal surface 11 such that the other isosceles trapezoidal surface 11b (mounting surface) faces the wall surface 32c facing the front side of the tool rotation direction T of the mounting seat 32. Is inserted between the first abutting surface 33 and the opposing surface 34 so that the side surface 12b extending in the direction of the tool body 21 faces the inside in the radial direction. Then, the first contact surface 33 and the side surface 12b connected to the long side are brought into close contact with each other.

Here, in the mounting seat 32 formed on the one end face 25 side, one arcuate cutting edge 13a is arranged so as to face the outside in the axis O direction, and the other arcuate cutting edge 13b is arranged in the axis O direction inside. The side surface 12a connected to the other arcuate cutting edge 13b is brought into contact with the second contact surface 35.
In addition, in the mounting seat 32 formed on the other end face 25 side, the other arcuate cutting edge 13b is arranged so as to face the outside in the axis O direction, and one arcuate cutting edge 13a is inward in the axis O direction. The side surface 12 a that is directed and continues to one arcuate cutting edge 13 a is brought into contact with the second contact surface 35.

  With the spherical cutter insert 10 placed on the mounting seat 32 in this manner, the clamp screw 40 is inserted through the insertion hole 14 and is drilled in the wall surface 32a facing the front side in the tool rotation direction T of the mounting seat 32. Screw into the clamp screw hole. Then, the head of the clamp screw 40 presses the tapered hole portion 14 a of the insertion hole 14 toward the mounting seat 32, and the spherical cutter insert 10 is fixed to the mounting seat 32.

  In the spherical cutter insert 10 mounted on the two mounting seats 32 formed on the end surfaces 25 facing the same side, the rake surfaces (one isosceles trapezoidal surface 11a) of the respective spherical cutter inserts 10 pass through the axis O. The rotation trajectory centered on the axis O of the arcuate cutting edge 13 formed on the spherical cutter insert 10 is centered on the center P (P ′). It is arranged so as to form one spherical surface R (R ′) having a larger step radius than the end surface 25.

  The insert detachable spherical cutter 20 is subjected to the cutting process shown in FIG. 7 after the spherical cutter insert 10 is mounted as described above. The insert detachable spherical cutter 20 according to the present embodiment does not include an adjustment mechanism for adjusting the position of the arcuate cutting blade 13 in the tool body 21, and is used for rough machining of the spherical counterbore portion. is there.

The insert detachable spherical cutter 20 is accommodated in a cavity C formed in the workpiece W, and a machine tool is inserted into a pair of insertion holes H, H formed coaxially in the workpiece W so as to be inserted into the cavity C. A pair of arbors A and A (not shown) are respectively inserted, and the tips of these arbors A and A are supported by attaching them to the attachment holes 27 from the outside in the direction of the axis O.
Here, a key drive portion D that fits in the key groove portion 28 of the mounting hole 27 is formed at the tip of the arbor A, and the tool main body 21 is attached to the arbor A by fitting the key groove portion 28 and the key drive portion D. , A is integrally rotated with the tool rotation direction T.

  While the tool body 21 is rotated around the axis O, feed is performed by the arbors A and A so as to reciprocate in both directions in the direction of the axis O together with the arbor A, A, thereby inserting the inner circumference of the cavity C of the workpiece W. Around the holes H, the arcuate cutting edge 13 of the spherical cutter insert 10 mounted on the mounting seat 32 of the end surface 25 facing each insertion hole H side has a center P (P ′) on the axis O, respectively. Concave spherical F counters F and F having the same diameter as the spherical surface R (R ′) are formed.

  Furthermore, the feed amount of the reciprocating motion of the tool main body 21 by the arbor A, A is determined by the arcuate cutting edge 13 of the spherical cutter insert 10 mounted on the mounting seat 32 of each end face 25 forming each counterbore F. By setting the positions of the centers P (P ′) of the spherical surface R (R ′) formed by the rotation trajectory to coincide with each other, the recesses formed by these counterbore portions F and F formed at both ends of the cavity C The spherical surface can be a concave spherical surface along one spherical surface R.

  In the spherical cutter insert 10 according to the present embodiment, since two arcuate cutting blades 13 and 13 are provided on one isosceles trapezoidal surface 11a, it is worn using one arcuate cutting blade 13a. Later, another arcuate cutting edge 13b of the spherical cutter insert 10 can be used, and the service life of the spherical cutter insert 10 can be extended.

  Arc-shaped cutting blades 13 and 13 are formed on a pair of oblique sides of one isosceles trapezoidal surface 11a, respectively, and the short side of this isosceles trapezoidal surface 11a when viewed from the side facing the one isosceles trapezoidal surface 11a. Since these arc-shaped cutting blades 13 and 13 are arranged symmetrically with respect to a reference line S that bisects perpendicularly to the long side, a mounting seat formed on one end 24 of the tool body 21 One arcuate cutting edge 13a can be used when mounted on 32, and another arcuate cutting edge 13b can be used when mounted on the mounting seat 32 formed on the other end 24. Therefore, this one type of spherical cutter insert 10 can be used as a right-handed and left-handed insert, and it is not necessary to manufacture and manage two types of inserts, thereby reducing the cost of using the spherical cutter insert 10. be able to.

In addition, since the first abutment surface 33 that abuts against the side surface 12b continuous with the long side of the isosceles trapezoidal surface 11 is formed on the mounting seat 32, the radial position of the spherical cutter insert 10 is fixed. Can do.
Further, since the mounting seat 32 is formed with the second contact surface 35 with which the side surface 12a connected to the arcuate cutting blade 13 directed inward in the direction of the axis O is contacted, the axis O of the spherical cutter insert 10 is formed. The position can be fixed.

  Further, the side surface 12a connected to the arcuate cutting edge 13 is a flank, and the side surface 12a is inclined so as to gradually recede toward the inside of the isosceles trapezoidal surface 11 as it is separated from the one isosceles trapezoidal surface 11a. Therefore, a positive clearance angle is given to the flank, and the cutting of the arcuate cutting edge 13 can be improved and cutting can be performed well.

The spherical cutter insert and the insert detachable spherical cutter according to the embodiment of the present invention have been described above. However, the present invention is not limited to this, and can be appropriately changed without departing from the technical idea of the present invention. It is.
For example, the outer shape has been described as an insert for a spherical cutter having an isosceles trapezoidal flat plate shape, but the present invention is not limited to this, and a pair of arcuate cutting blades are arranged symmetrically with respect to a reference line as viewed from the rake face. If it was done.

  Further, the side surface connected to the arcuate cutting edge is a flank, and the flank is inclined so as to gradually recede toward the inside of the isosceles trapezoidal surface as it is away from the isosceles trapezoidal surface. Although described as a type of insert, it is not limited to this, and it may be a negative type insert in which a clearance angle is not attached to the flank. However, the configuration as in this embodiment is preferable because the sharpness of the arcuate cutting edge can be improved and cutting can be performed well.

In addition, the first and second contact surfaces are formed on the mounting seat. However, the present invention is not limited to this, and the contact for fixing the position of the arcuate cutting blade is not limited thereto. It suffices if a surface is formed.
Furthermore, although the description has been made with the configuration in which a key groove is provided in the mounting hole and fitted with the key drive portion of the arbor and rotated, the present invention is not limited to this, and the tool body together with the arbor by a square hole, a spline shaft, etc. It is good also as a structure which rotates.

It is a top view of the insert for spherical cutters which is an embodiment of the present invention. It is a X direction arrow line view in FIG. It is a Y direction arrow directional view in FIG. It is a Z direction arrow directional view in FIG. It is a side view of a detachable spherical cutter. FIG. 6 is an end view of the insert-detachable spherical cutter shown in FIG. 5. It is explanatory drawing of the state which cuts a workpiece | work with the insert detachable spherical cutter shown in FIG.

Explanation of symbols

10 Insert for spherical cutter 11 Trapezoidal surface (polygonal surface)
12 Side 13 Arc-shaped cutting blade 20 Insert detachable spherical cutter 21 Tool body 25 End surface 32 Mounting seat 33 First contact surface (contact surface)
35 Second contact surface (contact surface)

Claims (4)

An insert for a spherical cutter to be attached to a spherical cutter that forms a spherical counterbore in a cavity provided in the workpiece,
The outer shape is a polygonal flat plate shape, has two polygonal surfaces and side surfaces intersecting these polygonal surfaces, and one polygonal surface is a rake surface,
The one polygonal surface is formed with a pair of circular arc ridges that are curved toward the outer peripheral side of the polygonal surface and are arranged symmetrically with respect to the side facing the rake face, An insert for a spherical cutter, characterized in that an arcuate cutting edge is provided at the arc ridge. The outer shape is an isosceles trapezoidal flat plate shape, has two isosceles trapezoidal surfaces and the side surface intersecting these isosceles trapezoidal surfaces, and one isosceles trapezoidal surface is a rake face,
A pair of hypotenuses provided on the one isosceles trapezoid surface is a pair of the arc ridge line portions, and the pair of arc ridge line portions are viewed from a side facing the one isosceles trapezoid surface. The spherical cutter insert according to claim 1, wherein the spherical cutter insert is formed symmetrically with respect to a reference line that bisects the long side and the short side of one isosceles trapezoidal surface.   The side surface connected to the arcuate cutting edge is inclined so as to gradually recede toward the inner peripheral side of the polygonal surface as it is separated from the one polygonal surface. Or the insert for spherical cutters of Claim 2. An insert detachable spherical cutter, which is mounted with the spherical cutter insert according to any one of claims 1 to 3 and forms a spherical counterbore in a cavity provided in a workpiece by the arcuate cutting blade. There,
A tool body that is rotated about an axis, and each of the tool body has mounting seats formed on both end faces facing the axial direction, and the mounting seat has a position for positioning the arcuate cutting blade. An insert detachable spherical cutter characterized in that a contact surface is formed.

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